There's a couple layers here, starting with him being way too loyal to guys he likes, but that's not a recruiting issue. It's not a recruiting issue that Hefner was on the team for five years. Hell Hefner was a ranked player, at one point he was a top 150 player, and he was recruited by Houston, Oklahoma, Clemson and others.
The second is I'm not sure it's a good idea to take what Buzz says about some of this stuff literally. Do we really think he signed a guy that's never seen video of at all? I find that EXTREMELY hard to believe. The only way I think it's true is if there's someone on the staff who he absolutely implicitly trusts with talent evals, which also seems extremely unlikely. But maybe he does, and if that person says they're good, then Buzz just does the recruiting part of it. MAYBE that's what's happening, but if that's the case then it's not like nobody evaluated Carter.
But I'd argue that recruiting ability ("can I get this player I want") and roster management are separate things. I think he's decent-to-pretty-good at recruiting considering what we're working with. I don't think he's been good at overall roster management.